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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >alias</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="Common Commands" HREF="common-commands.html"><LINK REL="PREVIOUS" TITLE="Common Commands" HREF="common-commands.html"><LINK REL="NEXT" TITLE="baudrate" HREF="baudrate-command.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="common-commands.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="baudrate-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="ALIAS-COMMAND">alias</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN2927" ></A ><H2 >Name</H2 >alias -- Manipulate command line aliases</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN2930"><H2 >Synopsis</H2 ><P ><B CLASS="COMMAND" >alias</B > {<TT CLASS="REPLACEABLE" ><I > name</I ></TT >} [<TT CLASS="REPLACEABLE" ><I > value</I ></TT >]</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN2937" ></A ><H2 >Arguments</H2 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN2939"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Name</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Type</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Description</TH ><TH WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Default</TH ></TR ></THEAD ><TBODY ><TR ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="REPLACEABLE" ><I >name</I ></TT ></TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Name</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >The name for this alias.</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >none</I ></SPAN ></TD ></TR ><TR ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="REPLACEABLE" ><I >value</I ></TT ></TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >String</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" >Replacement value for the alias.</TD ><TD WIDTH="25%" ALIGN="LEFT" VALIGN="TOP" ><SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >none</I ></SPAN ></TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN2966" ></A ><H2 >Description</H2 ><P >The <B CLASS="COMMAND" >alias</B > command is used to maintain simple command line aliases. These aliases are shorthand for longer expressions. When the pattern %{name} appears in a command line, including in a script, the corresponding value will be substituted. Aliases may be nested. </P ><P >If no value is provided, then the current value of the alias is displayed. </P ><P >If the system supports non-volatile configuration data via the <B CLASS="COMMAND" >fconfig</B > command (see <A HREF="persistent-state-flash.html" >the Section called <I >Persistent State Flash-based Configuration and Control</I > in Chapter 2</A >), then the value will be saved and used when the system is reset. </P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN2974" ></A ><H2 >Examples</H2 ><P >Set an alias. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >alias joe "This is Joe"</B ></TT > Update RedBoot non-volatile configuration - continue (y/n)? n</PRE ></TD ></TR ></TABLE > </P ><P >Display an alias. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >alias joe</B ></TT > 'joe' = 'This is Joe'</PRE ></TD ></TR ></TABLE > </P ><P >Use an alias. Note: the <B CLASS="COMMAND" >"="</B > command simply echoes the command to to console. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" > RedBoot> <TT CLASS="USERINPUT" ><B >= %{joe}</B ></TT > This is Joe</PRE ></TD ></TR ></TABLE ></P ><P >Aliases can be nested. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >RedBoot> <TT CLASS="USERINPUT" ><B >alias frank "Who are you? %{joe}"</B ></TT > Update RedBoot non-volatile configuration - continue (y/n)? n RedBoot> <TT CLASS="USERINPUT" ><B >= %{frank}</B ></TT > Who are you? This is Joe</PRE ></TD ></TR ></TABLE ></P ><P >Notice how the value of %{frank} changes when %{joe} is changed since the value of %{joe} is not evaluated until %{frank} is evaluated. <TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >RedBoot> <TT CLASS="USERINPUT" ><B >alias joe "This is now Josephine"</B ></TT > Update RedBoot non-volatile configuration - continue (y/n)? n RedBoot> <TT CLASS="USERINPUT" ><B >= %{frank}</B ></TT > Who are you? This is now Josephine</PRE ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="common-commands.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="baudrate-command.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Common Commands</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="common-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >baudrate</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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